Supporting frame



FIG. 1 is a perspective view of a supporting frame showing my new design:

FIG. 2 is a front elevational view thereof:

FIG. 3 is a rear elevational view thereof:

FIG. 4 is a left side elevational view thereof:

FIG. 5 is a right side elevational view thereof:

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a supporting frame, as shown. 